diff --git a/netwerk/base/src/nsProtocolProxyService.cpp b/netwerk/base/src/nsProtocolProxyService.cpp
index d4b033b31811..89859d275710 100644
--- a/netwerk/base/src/nsProtocolProxyService.cpp
+++ b/netwerk/base/src/nsProtocolProxyService.cpp
@@ -476,6 +476,8 @@ static const char kProxyType_DIRECT[] = "direct";
 const char *
 nsProtocolProxyService::ExtractProxyInfo(const char *start, PRBool permitHttp, nsProxyInfo **result)
 {
+    *result = nsnull;
+
     // see BNF in nsIProxyAutoConfig.idl
 
     // find end of proxy info delimiter